[3.16.y-ckt stable] Patch "mm/hwpoison: fix page refcount of unknown non LRU page" has been added to staging queue
Luis Henriques
luis.henriques at canonical.com
Thu Sep 3 10:37:50 UTC 2015
This is a note to let you know that I have just added a patch titled
mm/hwpoison: fix page refcount of unknown non LRU page
to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree
which can be found at:
http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue
This patch is scheduled to be released in version 3.16.7-ckt17.
If you, or anyone else, feels it should not be added to this tree, please
reply to this email.
For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable
Thanks.
-Luis
------
>From 26266ba76edea08806f1e3823e40dd78c301c05f Mon Sep 17 00:00:00 2001
From: Wanpeng Li <wanpeng.li at hotmail.com>
Date: Fri, 14 Aug 2015 15:34:56 -0700
Subject: mm/hwpoison: fix page refcount of unknown non LRU page
commit 4f32be677b124a49459e2603321c7a5605ceb9f8 upstream.
After trying to drain pages from pagevec/pageset, we try to get reference
count of the page again, however, the reference count of the page is not
reduced if the page is still not on LRU list.
Fix it by adding the put_page() to drop the page reference which is from
__get_any_page().
Signed-off-by: Wanpeng Li <wanpeng.li at hotmail.com>
Acked-by: Naoya Horiguchi <n-horiguchi at ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
mm/memory-failure.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index fad245565616..3fd99140bd6c 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1514,6 +1514,8 @@ static int get_any_page(struct page *page, unsigned long pfn, int flags)
*/
ret = __get_any_page(page, pfn, 0);
if (!PageLRU(page)) {
+ /* Drop page reference which is from __get_any_page() */
+ put_page(page);
pr_info("soft_offline: %#lx: unknown non LRU page type %lx\n",
pfn, page->flags);
return -EIO;
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